CATEngine Parts

259-0630 Stick Cylinder Seal Kit — Cat 3066 318Cl

This is a stick cylinder seal kit designed to replace worn seals within the hydraulic cylinder of Caterpillar equipment, specifically for the boom or stick articulation. It is manufactured to OEM standards to ensure a tight seal, preventing hydraulic fluid leaks and maintaining optimal cylinder performance. Leaking cylinder seals can result in slow or jerky boom/stick movement, loss of holding pressure, and potential hydraulic system contamination.

Stick Cylinder Seal Kit – Part No 259-0630 – CAT Spare Part
Part Specifications
BrandCAT
CategoryEngine Parts
ConditionAftermarket — OEM Specification
DispatchSame-day from Mumbai (before 3 PM IST)
GST InvoiceAvailable — all orders
Export DocsCommercial invoice, packing list, COO

Compatible Models

Always verify with serial number before ordering.

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Installation & Application Notes

Inspect mating surfaces for wear before fitting. Use torque specs from service manual. Replace gaskets and seals as a set — reusing compressed gaskets causes oil leaks. Clean all oil passages with compressed air.

Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.

Part TypeStick Cylinder Seal Kit
MaterialNBR rubber, polyurethane
ApplicationHydraulic cylinder sealing
Service LifeReplace when cylinder performance degrades
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first noticeable symptom of failing stick cylinder seals is often a slow drift or gradual lowering of the boom or stick when not actively being operated. If ignored, the cylinder may exhibit jerky movements, reduced lifting capacity, and external hydraulic fluid leaks. The worst consequence is potential loss of hydraulic pressure and contamination of the hydraulic system, leading to damage to other components.

Installation Tip

Thoroughly clean the cylinder bore and piston rod before installing the new seals to prevent damage. Ensure all seals are correctly oriented and seated properly to prevent immediate leaks.

Service Note

Inspect the cylinder rod for scoring or damage and clean the hydraulic fluid and filter when replacing cylinder seals.